<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>4背景图片案例</title>
  <style>
    body {
      background: url(/image/3.jpg);
      background-repeat: no-repeat;
      background-position: center top;

    }
  </style>
</head>
<body>
 
  
</body>
</html>